Safety supporting device for deep foundation pit construction

The utility model relates to a safety supporting device for deep foundation pit construction. A left support pile is arranged on the left side of the support plate; a first anchor rod hole is formed in the left support pile; a right support pile is arranged on the right side of the support plate; a second anchor rod hole is formed in the right support pile; the upper ends of the left supporting pile, the supporting plate and the right supporting pile are connected with the lower end of the blocking beam. Spherical hinges are arranged at the lower ends of the supporting plates; a spherical hinge fixing piece is arranged at the lower end of the spherical hinge; the supporting plate rotates with the spherical hinge as a fulcrum. According to the safety supporting device for deep foundation pit construction, the use flexibility is improved, and meanwhile, flexible angle adjustment can be conducted, so that anchor rods at different angles can be installed and connected through the supporting device, and the applic